{"id":76791,"date":"2020-04-04T19:42:31","date_gmt":"2020-04-04T17:42:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki"},"modified":"2020-04-04T19:42:31","modified_gmt":"2020-04-04T17:42:31","slug":"amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/amerikanczy-predlozhili-sobirat-energiyu-dlya-interneta-veshhej-iz-magnitnyh-polej-blizhajshej-elektroprovodki","title":{"rendered":"Gli americani hanno proposto di raccogliere energia per l'Internet delle cose dai campi magnetici delle linee elettriche pi\u00f9 vicine","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Il tema dell'estrazione di elettricit\u00e0 dall'\u00abaria\u00bb \u2014 dal rumore elettromagnetico, dalle vibrazioni, dalla luce, dall'umidit\u00e0 e da molte altre fonti \u2014 interessa sia i ricercatori civili che i loro colleghi in divisa. Il loro contributo a questo argomento \u00e8 stato dato dagli scienziati<\/a><\/noindex> dell'Universit\u00e0 della Pennsylvania. Dai campi magnetici delle linee elettriche nelle vicinanze, sono riusciti a estrarre elettricit\u00e0 con una potenza di alcuni milliwatt, sufficiente, ad esempio, per alimentare direttamente una sveglia digitale.<\/p>\n

\"Gli<\/p>\n

Nell'articolo pubblicato sulla rivista Energy & Environmental Science<\/a><\/noindex> gli scienziati hanno descritto i calcoli e la realizzazione di convertitori speciali per trasformare i campi elettromagnetici in corrente elettrica. L'elemento estrattore \u00e8 realizzato come una piastra sottile a pi\u00f9 strati con un magnete permanente all'estremit\u00e0 libera (l'altra estremit\u00e0 della piastra \u00e8 fissata saldamente). La piastra stessa \u00e8 composta da uno strato di materiale piezoelettrico e uno strato di materiale magnetostrittivo<\/a><\/noindex> (Fe85B5Si10 Metglas).<\/p>\n

Il materiale magnetostrittivo \u00e8 interessante poich\u00e9, al variare dello stato di magnetizzazione, il suo volume e le dimensioni lineari cambiano. Il fastidioso ronzio delle bobine nelle schede grafiche \u00e8 generalmente causato dalle variazioni magnetostrittive nei nuclei. In un campo magnetico alternato di normali linee elettriche con frequenza di 50 o 60 Hz, la piastra in Metglas inizia a vibrare e a deformare la piastra di piezoelettrico incollata ad essa. In un circuito collegato alle piastre inizia a fluire corrente.<\/p>\n

\"Gli<\/p>\n

Tuttavia, il materiale magnetostrizionale abbinato a un piezoelettrico genera solo fino al 16 % dell'elettricit\u00e0 prodotta dall'elemento. La principale produzione \u00e8 fornita dall'oscillazione di un magnete permanente in un campo elettromagnetico. Si afferma che la tensione di picco sull'elemento raggiunga i 80 V in un campo di 300 \u00b5T. Ma la cosa pi\u00f9 preziosa \u00e8 che l'elemento sviluppato poteva estrarre energia sufficiente per alimentare direttamente un orologio digitale in un campo inferiore a 50 \u00b5T a una distanza di 20 cm dai cavi elettrici.<\/p>\n

<\/center><\/p>\n

La ricerca degli scienziati dell'Universit\u00e0 della Pennsylvania \u00e8 stata condotta insieme ai ricercatori della Virginia Tech e a un gruppo del Comando per lo Sviluppo delle Capacit\u00e0 di Combattimento dell'Esercito degli Stati Uniti.<\/p>\n

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Fonte: 3dnews.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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